The Dark Room on AllMovie

Amateur acting on the part of newcomer Svet Kovich as the deranged son of a philandering doctor, and the inexperience of first-time director Paul Harmon are partly balanced by the excellent cinematography of Paul Onorato in this unexceptional melodrama, never released theatrically. Dr. Ray Sangster (Alan Cassell) is having an affair with Nicky (Anna Jamison), a fashion designer. Sangster is unknowingly followed about and photographed by his son. The son's objective is not to blackmail the illicit couple but to bed down Nicky himself. When he finally manages to achieve that objective, under an assumed identity, he is overcome by impotence -- which sets him off into completely irrational acts.